An entomologist is studying insect pollination and models the number of flowers \( F \) pollinated by bees as a quadratic function of time \( t \) in hours: \( F(t) = pt^2 + qt + r \). If 15 flowers are pollinated after 1 hour, 40 after 2 hours, and 75 after 3 hours, determine the values of \( p \), \( q \), and \( r \). - Crosslake